Exploring the Enchanting Realm of Reakirt’s Blue Butterfly

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The Reakirt’s Blue Butterfly, scientifically known as Echinargus isola, is a distinct species within the butterfly family.

Native to regions spanning Central America and the southern U.S., this butterfly is recognized for its unique coloration and patterns.

Understanding and studying the Reakirt’s Blue Butterfly is crucial, not just for its aesthetic appeal but also for the insights it offers into butterfly migration, behavior, and adaptation in various habitats.

In this article, we will learn all about this beautiful butterfly.

BLUE, REAKIRT’S. Source: ALAN SCHMIERER, CC0, via Wikimedia Commons

Taxonomy and Classification

  • Kingdom: Animalia
  • Phylum: Arthropoda
  • Class: Insecta
  • Order: Lepidoptera
  • Family: Lycaenidae
  • Genus: Echinargus
  • Species: E. isola

The Reakirt’s Blue is part of the Lycaenidae family, commonly referred to as the gossamer-winged butterflies.

Members of this family are small and often brightly colored.

Physical Description

The Reakirt’s Blue Butterfly is a relatively small butterfly with specific features that make it easily distinguishable:

The butterfly boasts a wingspan ranging from 16–23 mm, making it a compact species compared to many other butterflies.

The upper side of the male Reakirt’s Blue is predominantly blue with a brownish margin.

It often displays one prominent blackish spot and occasionally one or two tiny spots near the hind angle of the hind wing.

The underside of the butterfly is characterized by grayish or brownish spots rimmed in white.

Source: Judy GallagherCC BY 2.0, via Wikimedia Commons

Certain spots, especially on the front wing, are more prominent and blackish.

The butterfly also has noticeable dark eye spots near the hind angle of the hind wing, which are accentuated with metallic scaling.

Female Reakirt’s Blues are similar in appearance to the males when viewed from above. 

However, they are predominantly brownish, with the blue coloration more pronounced towards the base of the wings and on the body.

The dark spots on females are generally more prominent and bordered in pale shades.

Distribution and Habitat

The Reakirt’s Blue Butterfly has a broad distribution, influenced by its migratory behavior:

  • Native Regions: The butterfly is native to Central America and the extreme southern parts of the U.S..
  • Migratory Patterns: The Reakirt’s Blue Butterfly is known for its extensive migratory patterns. It regularly travels throughout most of the U.S., reaching almost to the Canada–United States border. On rare occasions, it has been spotted in the southern prairies of Canada.
  • Habitats: This butterfly is versatile and can be found in a variety of habitats. These include fields, gardens, open areas, and areas with host plants. It is particularly attracted to regions with Fabaceae plants, especially mesquites.
  • Sightings in Alabama and Other States: While the Reakirt’s Blue Butterfly primarily resides in its native regions, it is known to venture out. In the U.S., it has been spotted as a vagrant in states like Alabama, particularly in Jefferson county.
Reakirt's blue (Echinargus isola) dorsal
Source: Flickr, User: Anne Toal

Life Cycle of the Reakirt’s Blue Butterfly

The life cycle of the Reakirt’s Blue Butterfly, like other butterflies, consists of four distinct stages: egg, larva (caterpillar), pupa (chrysalis), and adult.


  • Laying: After mating, female Reakirt’s Blue Butterflies lay their eggs on suitable host plants, particularly those from the Fabaceae family. The choice of host plant is crucial as it provides the emerging larvae with their initial food source.
  • Appearance: The eggs are tiny, round, and pale in color. They are often laid singly or in small clusters on the undersides of leaves to protect them from predators and harsh environmental conditions.

Larva (Caterpillar)

  • Feeding: Upon hatching, the larvae immediately begin to feed on the host plant. Their primary diet consists of mesquites from the Prosopis species. As they consume the plant material, they grow rapidly, undergoing several molts.
  • Appearance: The caterpillar of the Reakirt’s Blue Butterfly is slender with a segmented body. It may have fine hairs and be colored to blend in with the host plant, providing camouflage against predators.
  • Molting: As the caterpillar grows, it undergoes several molting phases, shedding its old skin to accommodate its increasing size.
Source: Flickr, Username: Keith Roragen

Pupa (Chrysalis)

  • Transformation: After reaching a certain size and undergoing the final molt, the caterpillar enters the pupal stage. It attaches itself to a stem or leaf using silk threads and forms a protective casing known as a chrysalis.
  • Metamorphosis: Inside the chrysalis, a remarkable transformation occurs. The caterpillar’s body undergoes significant changes, restructuring itself to form the adult butterfly. This process includes the development of wings, antennae, and other adult features.


  • Emergence: Once metamorphosis is complete, the adult butterfly emerges from the chrysalis. Initially, its wings are soft and folded. The butterfly rests, allowing hemolymph (insect blood) to pump into its wings, expanding and hardening them.
  • Feeding: Adult Reakirt’s Blue Butterflies feed on nectar from flowers. Their proboscis, a long, coiled tube, is used to extract nectar from deep within flowers.
  • Reproduction: After reaching maturity, the adult butterflies seek mates to reproduce, continuing the cycle. They use visual and chemical cues to identify suitable partners.


The Reakirt’s Blue Butterfly is known to have multiple broods in a year, depending on the weather conditions.

In the far south, where temperatures are consistently warm, the butterfly can reproduce year-round.

However, in the northern regions, the number of broods is influenced by the arrival time of the first strays from the south each year.

Depending on the conditions, there can be one to three broods in the north.

Reakirt's Blue
Source: Flickr, Username: Patrick Dockens


Feeding Habits

The caterpillar stage of Reakirt’s Blue Butterfly primarily feeds on plants from the Fabaceae family.

Mesquites, belonging to the Prosopis species, are particularly favored by the larvae.

This feeding behavior plays a crucial role in their growth and eventual metamorphosis into adult butterflies.

Once metamorphosed into their adult form, the Reakirt’s Blue Butterfly’s diet shifts from plant matter to nectar.

They are often observed nectaring at various flowers, extracting the sweet liquid which provides them with the necessary energy for flight and reproduction.

Flight Patterns and Seasons

The Reakirt’s Blue Butterfly exhibits specific flight patterns influenced by seasonal changes.

In the northern regions of its distribution, the butterfly is typically active from June to October.

However, in the southern areas, where temperatures are milder, the butterfly can be observed year-round.

Their flight is swift and often close to the ground, making them a delightful sight in gardens and open fields.

Reakirt's Blue
Source: Flickr, Username: Cataloging Nature

Symbolism in Different Cultures

The symbolism of butterflies, particularly blue ones, transcends many cultures, each attributing unique meanings and significance to these delicate creatures.

Native American Cultures

Within Native American traditions, the blue butterfly is often seen as a potent symbol. It represents both birth and rebirth.

Symbol of Transformation and Joy:

Across various cultures, the blue butterfly is emblematic of transformation and joy.

Its metamorphosis from a ground-bound caterpillar to a free-flying butterfly is a powerful representation of change, growth, and freedom.

The vibrant blue hue of its wings, often associated with the sky and open spaces, further emphasizes feelings of joy, hope, and expansiveness.

Connection to Pregnancy

The blue butterfly holds special significance in the context of pregnancy and birth. It is often seen as a symbol of good fortune, heralding positive outcomes and blessings.

Additionally, some believe that the appearance of a blue butterfly can signify communication from departed loved ones, offering comfort and a sense of connection to those who have experienced loss or are seeking guidance during their pregnancy journey.

Frequently Asked Questions

How rare are blue butterflies?

Blue butterflies, while not the most common, can be found in various regions around the world. 

Their rarity often depends on the specific species, habitat, and region.

For instance, the Reakirt’s Blue Butterfly is more commonly found in Central America and the southern U.S. but can occasionally be seen in northern regions due to migration.

Factors like habitat loss and climate change can also impact their populations, making certain species rarer than others.

What kind of blue butterflies are there?

There are numerous species of blue butterflies, each with its unique characteristics and habitats. Some of the notable ones include:

There are many more species, each with its distinct range, behavior, and appearance.


With its striking blue hue and unique patterns, the Reakirt’s Blue Butterfly has captivated the attention of both enthusiasts and researchers alike.

Native to Central America and the southern U.S., its migratory patterns and adaptability have allowed it to grace various regions, making it a subject of interest for many.

Beyond its physical beauty, this butterfly holds deep symbolic meanings, from representing birth and rebirth in Native American cultures to symbolizing joy and transformation in others.

We have tried to cover most of the information related to this beautiful butterfly in the sections above.

Reader Emails

Over the years, our website, whatsthatbug.com has received hundreds of letters and some interesting images asking us about these insects. Scroll down to have a look at some of them.

Letter 1 – Mating Reakirt’s Blues

Subject: Butterfly
Location: LaMarque
November 3, 2012 7:46 pm
These two were sharing their love for several minutes. I couldn’t resist taking this shot. What species are they?
Signature: Thanks, Tx Finest

Mating Reakirt’s Blues

Hi again Tx Finest,
The Blues can be a difficult group of butterflies to identify to the species level, but we believe we have correctly identified this mating pair as Reakirt’s Blues,
Echinargus isola, based on these photos pasted to BugGuide.


  • Bugman

    Bugman aka Daniel Marlos has been identifying bugs since 1999. whatsthatbug.com is his passion project and it has helped millions of readers identify the bug that has been bugging them for over two decades. You can reach out to him through our Contact Page.

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  • Piyushi Dhir

    Piyushi is a nature lover, blogger and traveler at heart. She lives in beautiful Canada with her family. Piyushi is an animal lover and loves to write about all creatures.

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